Heavy Duty HD Tube - STI

• STI Motorcycle Tubes are strong, stronger, strongest. The HD “Heavy Duty” model is 50 percent thicker than most standard tubes on the market today. The HDs are made from high quality butyl rubber with a 2mm thickness. STI’s XD “Extreme Duty” butyl rubber uses a 3mm spec, making it 30 percent beefier than most heavy duty tubes now available. The XD is specifically designed for severe applications and has already been proven in off-road competition. Now, STI has released the all-new UD “Ultra Heavy Duty” tubes that utilize a nearly bombproof 4mm thickness.